I did go from 10.4. to 11. I did not modify the font at runtime. This FMX btw. DPI is not in the FMX:
Left = 0
Top = 0
Caption = 'nut.s Rezept - Schnittstelle v0'
ClientHeight = 962
ClientWidth = 1010
Fill.Color = xFFF0F0F0
Fill.Kind = Solid
Position = Designed
FormFactor.Width = 1440
FormFactor.Height = 900
FormFactor.Devices = [Desktop]
OnClose = FormClose
DesignerMasterStyle = 0